"Calgary Flames
Following the 2015–16 season, Ottawa and Chiasson again clashed over a new contract, unable to agree to a dollar value. As such, the Senators traded Chiasson to the Calgary Flames in exchange for Patrick Sieloff on June 27, 2016.[14] He was promptly signed as a restricted free agent to a one-year $800,000 contract with the Flames.[15] He rebounded offensively with the Flames in the 2016–17 season, providing depth scoring with 12 goals and 24 points in 81 games. As an arbitration eligible restricted free agent following a first-round exit in the post-season, Chiasson was not extended a qualifying offer by the deadline on June 26, 2017.[16]
Washington Capitals
On September 9, 2017, the Washington Capitals signed Chiasson, then an unrestricted free agent, to a professional tryout (PTO).[17] Following training camp and preseason, on October 4, 2017, the Capitals signed Chiasson to a $660,000 one-year contract.[18] Chiasson won his first Stanley Cup in 2018 with the Capitals.
Edmonton Oilers
On September 10, 2018, Chiasson signed a professional try out contract with the Edmonton Oilers,[19] and on October 2, signed a one-year contract with the Oilers.[20] With the Oilers, Chiasson set a new career high for most goals in a season, scoring his 14th on December 14, 2018, against Anthony Stolarz of the Philadelphia Flyers in a 4–1 victory.
On April 26, 2021, Chiasson scored his 100th career goal in the NHL, opening the scoring in a 6–1 victory over the Winnipeg Jets.[21][22]
Vancouver Canucks
On October 12, 2021, Chiasson signed a one year contract with the Vancouver Canucks worth $750k, after a successful try-out in training camp.[23]"